Servo-Hydraulic and an All-Electric Injection Molding Machine

Injection molding machines enable the mass production of intricate plastic components with high precision. Two prominent types of injection molding machines are servo-hydraulic and all-electric machines.

While both serve the same fundamental purpose, there are significant differences in their operational mechanisms and characteristics.


Servo-Hydraulic Injection Molding Machines


Servo-hydraulic machines combine hydraulic power with an advanced servo system to achieve more energy-efficient and precise operations compared to traditional hydraulic machines. These machines utilize hydraulic cylinders for clamping and injection functions while employing servo motors for auxiliary movements such as screw rotation and ejection.


Advantages of Servo-hydraulic Machines


Energy Efficiency


Servo-hydraulic machines optimize energy consumption by using servo motors that adjust power output based on actual requirements. This results in reduced energy consumption and operational costs.


Enhanced Precision


The integration of servo systems enables superior control over clamping force, injection speed, and position, leading to improved part quality and dimensional accuracy.


Wide Range of Applications


Servo-hydraulic machines are suitable for a broad range of applications, including large and complex parts that require substantial clamping force and high injection pressure.


All-electric Injection Molding Machines


All-electric machines have gained popularity due to their advanced electric drive systems, offering precise control and high-speed operation. Instead of hydraulic power, these machines utilize electric servo motors for all machine movements, including clamping, injection, and ejection.


Advantages of All-electric Machines


Energy Efficiency


All-electric machines are highly energy-efficient as they only consume electricity when the machine is in operation, reducing energy waste during idle or cooling periods.


High Speed and Accuracy


The absence of hydraulic components results in faster response times, allowing for shorter cycle times and increased productivity. Additionally, precise control over machine movements leads to excellent part repeatability and dimensional accuracy.


Clean and Environmentally Friendly


All-electric machines eliminate the need for hydraulic oil, reducing the risk of oil leaks, and minimizing environmental impact.


Choosing the Right Machine for Your Application


The choice between a Servo-Hydraulic and an all-electric injection molding machine depends on various factors, including specific application requirements, production volume, part complexity, and budget constraints.


Consider the following guidelines when selecting the appropriate machine:


Application Requirements


Determine the required clamping force, injection speed, and precision needed for your application. Servo-hydraulic machines are more suitable for applications requiring high force and pressure, such as large parts or materials with high viscosity. All-electric machines are ideal for applications demanding high precision and fast cycle times.


Production Volume


Consider the anticipated production volume. Servo-hydraulic machines are commonly used for high-volume production due to their robustness and ability to sustain continuous operation. All-electric machines are advantageous for low to medium production volumes, where rapid setup, quick changeovers, and shorter cycle times are crucial.


Part Complexity


Evaluate the complexity and intricacy of the parts to be manufactured. Servo-hydraulic machines are better suited for molding parts with complex geometries, multi-cavity molds, or thick-walled components. All-electric machines excel in producing small to medium-sized parts with high precision, such as electronics, medical devices, and optical components.


Energy Efficiency


Consider the long-term energy consumption and operational costs. All-electric machines offer substantial energy savings due to their precise control over motor movements and reduced idle power consumption. However, if energy costs are not a significant concern and the application requires high force, a Servo-hydraulic machine may be more appropriate.


Budget Constraints


Evaluate the initial investment and total cost of ownership. All-electric machines tend to have a higher upfront cost, but their energy efficiency and reduced maintenance requirements can result in long-term cost savings. Servo-hydraulic machines may have a lower initial investment but require regular maintenance and potential hydraulic system replacements.




Servo-hydraulic and all-electric injection molding machines offer distinct advantages and considerations depending on the specific application requirements.

Servo-hydraulic machines provide high clamping force and are suitable for a wide range of applications, while all-electric machines offer precise control, energy efficiency, and clean operation.

By carefully evaluating factors such as application requirements, production volume, part complexity, energy efficiency, and budget constraints, manufacturers can make an informed decision and choose the most suitable machine for their injection molding needs.